Brakes Dragging - Pushrod too long?

How straight is the angle of the pushrod when brakes are depressed.
If there is much angle the pushrod can stick on the edge of the master
cylinder. Mainly if aluminum master cylinder as that has a raised hub
and especially if bolted into firewall without adapter.

When I have had that issue - a little grinding on Master or LENGTHING the
pushrod help the geometry. Shortening it makes it worse!